| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 4 | |
| #2 | Switzerland | 3 | |
| #3 | Spain | 2 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Stapf Alfred | 8 |
| #2 | Hundrieser Hans | 8 |
| #3 | Alfred Stapf | 1 |
| #4 | Hans Hundrieser | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB147639A | Flat drill provided with breaking surfaces in the recesses of the cutting edge |